package com.ita.osc.filter;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.ita.osc.bean.User;
import com.ita.osc.util.JsonUtil;

/**
 * Servlet Filter implementation class UserPermissionFilter
 */
public class UserPermissionFilter implements Filter {

    /**
     * Default constructor. 
     */
    public UserPermissionFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		// place your code here
		HttpSession session = ((HttpServletRequest)request).getSession();
		User user = (User) session.getAttribute("user");
		if(user != null){			
			chain.doFilter(request, response);
		}else {
			PrintWriter writer = ((HttpServletResponse)response).getWriter();
			writer.println(JsonUtil.objetc2Json("Missing user"));
		}
		
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
